Hi ronfla,
Congratulations on your new mattress :).
You certainly made a great quality/value choice and I’m looking forward to your comments and feedback when you receive it.
I’m guessing that the platform/bedframe that they mentioned to you may have been this one and if it was then it would allow good airflow under your mattress.
There is also more information about the different types of support systems that generally work best for different types of mattresses in post #1 here that also includes examples of each of them as well that may also be helpful.
Phoenix